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120 205486 REV F Operations Manual, HPA2, Compact Outdoor SSPA
Byte Name Description Value
1 Address Address of SSPA 0x01 to 0x0f
2 Command Request Status
Transmit on/off
Change Address
Set Carrier Frequency †
Gain Adjust
0x01
0x02
0x03
0x04
0xFF
3 Data Byte 1 Not used if command = 0x01 ‡
Tx control if command = 0x02
New address if command = 0x03
Carrier Frequency if command = 0x04
Gain Adjust
0xAA
0 = Off, 1 = On
0x01 to 0x0f
MSbyte
0x01
4 Data Byte 2 Not used if command = 0x01 ‡
Not used if command = 0x02 ‡
Not used if command = 0x03 ‡
Carrier Frequency if command = 0x04
Gain Level
0xAA
0xAA
0xAA
LSbyte
0x01 to 0xF
5 Data Byte 3 Not Used ‡ 0xAA
6 Data Byte 4 Not Used ‡ 0xAA
7 Checksum Algebraic sum of bytes 1 - 6
Table D-2: Packet Structure
† - Dummy command; will have no effect on SSPA operation;
‡ - don’t care bytes; any value will be accepted as valid, as soon as checksum is correct.
Byte Name Description Value
1 Address † Address of BUC shifted left by 4 0x10 to 0xF0
2 Level Byte 1 MSbyte of Tx output power -
3 Level Byte 2 LSbyte of Tx output power -
4 Temperature Temperature in
o
C ‡ -
5 Status Byte 1 Bit 0: Temperature out of range
Bit 1: PLL out of lock
Bit 2: Checksum Error
Bit 3: Tx Status
Bits 4-7: Power Class
1: fault, 0: normal
1: fault, 0: normal
1: error, 0: normal
1: Tx on, 0: Tx off
0x1 to 0xF
6 Status Byte 2 Bits 0 - 3: Not Used
Bits 4 - 7: Software Version
0xA
0xF
7 Checksum Algebraic sum of bytes 1 - 6
Table D-3: Response Structure
† Addresses 1-15 only allowed. Make sure that SSPA unique address is within this range before switching to VSAT BUC
emulation protocol. Default address of BUC is 0x01.
‡ CO SSPA will always display internal plate temperature. Unlike the BUC even if mute state is on, current temperature value will be re-
ported.